Isn't this the same question you asked last week? I remember giving you an answer.

He indulged in a glass of wine If you add 'himself' he becomes the subject of his own act. However, we wish only to describe his act. As a phrasal verb, 'Indulge in' is probably the most common preposition. I can't think of an example of 'indulge with'. As a pure verb, you would phrase it like this: "he considered having a glass of wine, and then decided to indulge himself"